Convertible multiple capacity, hoist chain structure



June 20, 1944. E w COFFlNG 2,351,665

CONVERTiBLE, MULTIPLE CAPACITY, HOIST CHAIN STRUCTURE Filed Nov. 21, 1941 INVENTOR,

a 5 GM? 0 m m D f Patented June 20, 1944 GON'VERTIBIlEIMULTIPLEGAPAGITY, HOIST.

GHAIN'STRUGTURE V Fredrick w. caning;- Danvillglll; Application-November 21, 1941,.SerialNo. 4'19,870-:

4IClaims.

This: inventiom relates: to: a. chain: hoist and moretzparticularly aconvertible multiplesc-apacity chain-structuretherefor;

The chief;objectsof:this:;inventioniis toxprovide:.aachaimstructure'a.that isweadilwconvertible from one capacity andzspeedito: anotherrand with atminimumfiofiefiorti.

The chief feature: of this; invention consists in; including-"in a: load-.1 supporting; chain: structure, va:-.chain;.a;zload-zsupporttaand: a read-i-ly oper- 1 able:connectiomwhereby"theelatterr wheniaconditionedzincone positionytheshoist for one operation camelevate'onlower. :azloadrattone. speed? and if or thezsameoperationxwhen't otherwise conditioned inw another: positionz. can: elevate or: lower: twice that 1oad:.at: halfithe spreyious; speed:-

Another-chief featureiofrrthez.invention:resides more: specifically imtheL-snamhook, its mounting and chainiconnectiomwhereby suffir'zient strength and clearance is provided.

Otherjobjects' and; features of the invention will be set forth more fully hereinafter.

The full nature of the invention will be understood from the accompanying drawing and the following specification and claims:

In the drawing, Fig. 1 is a side elevation of a hoist, et cetera, embodying the invention, parts thereof being shown by full lines in the high speed half load condition, dotted lines of the same parts indicating the half speed full load condition.

Fig. 2 is a view at right angles to Fig. 1 of the sprocket pulley, snap-hook and anchorage portions of the invention.

Fig. 3 is a central sectional view through the snap-hook,

In the drawing, l indicates generally a hoist body of two pieces la and lob and the same .pivotally support a hoist supporting hook H. The hoist body mounts an operating and control handle l2-see Figs. 1 and 2f0rmed integral with the two-piece housing l0 and as extensions of the portions Illa and lb thereof, are the projections l3a and I30, respectively. Extending through the same are the apertures Ma and Mb. respectively.

Positioned in said apertures is the pivot member l5 having the head portion I So and apertured at l5b for cotter key I 6 reception. Positioned immediately adjacent each of the portions Ba and Nb are the links Na and 11b, same being spaced apart by the projecting portions I31; and I317. The free end of these links are connected by a similar pivot member l8 having the head portion [8a, and the aperture l8b at opposite ends, ,the latter..,receiving the cotter key l9. This provides a spacedportion on the member l8between. the two links l1a and Nb and this constitutes a hook anchorage and the resulting structure is a loop anchorage pivotally supported by the hoist housing I0.

A. chain: 20 .is: associated: withand: passes throughitthe housings? 1 0a and: l 01min the-usual manner, and one: end; thereof. may *be provided withra block portion; or1-the-::1ike;,2 l to prevent complete withdrawal of th chain through-:the

housing;

The "otherzendjofrthei chain 2lbsupports. a hook structurea-seea-Fig: 3.. This-:hook structure-,22.-

end:.23:providing a: throats 23a, between the a face 23b and the opposed face 230. The throat..2.3a-.is adapted to hook upon-and partially embrace the member-.18.-

Therbody portion. 22: of. the hook. is chambered. as l at- 25-: and: therein, is mounted. arball lockin-g member 26;. partially; exposed; to. the throat 23a upon the face 230. Said ball is normally constrained outwardly by means of spring 26a, the tension of which may be adjusted by the headless set screw 21. The body portion 22 is apertured as at 28 to receive the rivet 29 which unites the two spaced link members 30, a part of chain 20 and the end thereof.

There is provided a load support generally indicated by the numeral 3|. It is formed of two piecessee Figs. 1 and 2-which are suitably connected together and which pivotally support the retained portion of a load supporting hook 32. These supporting structures 30 also have two parallel ears and in the space therebetween is positioned a sprocket gear 34-see Figs. 1 and 2 rotatably supported upon a shaft 35, or the like, extending through the ears. The root of the groove or channel between the two ears indicated by the numeral 36, provides for a chain and hence, the teeth of the sprocket gear wheel 34 always mesh with the chain 20.

As illustrated by the full line showing in Fig. 1, the snap-hook structure 22 is engaged with the body portion 3|, since the former locks therewith and the sprocket as shown in Fig. 1 when the last link is in the channel, and hence, the support structure 3| is connected to the hoist by a single strand of chain. The operation of the hoist accordingly, will lift a load at a predetermined rate for a given operation of the handle [2 and a given load within the capacity of the load hook, chain, et cetera.

When it is desired to double the capacity of a single chain, the snap-hook is removed from the load support engagement full-line position see Fig. 1and snapped upon the member 3-- see dotted lines Fig. 1. In this position it will be apparent that the two strands of chain will be able to support double the previous load. However, since for the same given operation of the handle, each of the double strands move at the same rate, the result is that the rate of elevationor. lowering of the load will 'be half that of the initial rate of raising or lowering the load when a single strand arrangement is utilized as previously described.

For the purpose of a complete understanding of this invention, reference is had to the following Cofiing patents, which are representative of the type of hoist and. hoist mechanism more particularly included within the housings Illa and "lb or mounted on the housings I 00. and lob. These patents are Name I Number I Date June -7. 1932 Nov. 23,1933

While the invention has been illustrated .and described in great detailin the drawing and foregoing description, the same is to be considered as illustrative and not restrictive in character.

The several modifications described herein as well as others which will readily. suggest themselves to persons skilled in this art, all are considered to be'within the broad scope of the invention, reference being had to the appended claims.

The invention claimedis: I

1. In a chain hoist having a housing'with a chain channel therethrough, a link, load supporting, chain passable through the'channel, chain engaging and moving means in the housing, a load engaging hook responsive to chain movement, a channelled body means pivotally supporting the load engaging hook, and a chain engaging pulley in the channel, the chain bearing on the pulley for supporting and moving the body means, the combination of an anchor hook carried by one end of the chain and normally non-passable through the body means channel, a loop structurepermanently and pivotally mounted on the "housing between the entrance and outlet of the channel, the anchor hook having selective engagement with said loop structure for chain reeving purpose, and means carried by the anchor hook for detachably locking the loop structure and anchor hook together when in selected engagement.

2. Mechanism as defined by claim 1 characterized by the loop structure including a pair of spaced links, the housing pivot being interposed therebetween at one end, and the anchor hook engageable portion constituting the connection between the free and other ends of said links;

3. Mechanism as defined by claim 1'v characterized by the detachable'locking means including'a locking portion normally constrained to lockingposition at all times.

4. Mechanism as defined by claim.1 characterized by the loop structure including a pair of spaced links, the housing pivot being interposed therebetween at one end, and the anchor hook engageable portion constituting the connection between the free and other ends of said links, said anchorhook having pivotal 1 connection to the chain and a link free end connection receiving, angularly directed, notch, them'ou'th being between the pivotal connection and notch root, the locking means including a member exposed to the notch between the mouth and root therethe notch.

FREDRICK W. COFFING. 

